The present disclosure is directed to a phosphorus-modified ionic liquid compound, the synthesis thereof and an electrochemical cell electrolyte containing the phosphorus-modified ionic liquid compound.

The present invention discloses a chitin regenerative hydrogel and a preparation method and application thereof, which belong to the technical field of energy materials. The preparation method of the chitin regenerative hydrogel comprises the following steps: 1, performing heating dissolution and cooling molding on chitin and ionic liquid to obtain chitin-ionic liquid gel; and S2, soaking the chitin-ionic liquid gel into alkaline solution to obtain the chitin regenerative hydrogel. The chitin-ionic liquid gel and the chitin regenerative hydrogel that are prepared in the present invention have good restoring capacity and thixotropy capacity. The chitin-ionic liquid gel is soaked into potassium hydroxide aqueous solution for replacement to obtain the chitin-based regenerative hydrogel, the chitin-based regenerative hydrogel is taken as a polymer electrolyte diaphragm for assembling a supercapacitor, and the obtained capacitor has higher specific capacitance and charging/discharging efficiency, and good rate capability and reversibility.

The present invention discloses a chitin regenerative hydrogel and a preparation method and application thereof, which belong to the technical field of energy materials. The preparation method of the chitin regenerative hydrogel comprises the following steps: 1, performing heating dissolution and cooling molding on chitin and ionic liquid to obtain chitin-ionic liquid gel; and S2, soaking the chitin-ionic liquid gel into alkaline solution to obtain the chitin regenerative hydrogel. The chitin-ionic liquid gel and the chitin regenerative hydrogel that are prepared in the present invention have good restoring capacity and thixotropy capacity. The chitin-ionic liquid gel is soaked into potassium hydroxide aqueous solution for replacement to obtain the chitin-based regenerative hydrogel, the chitin-based regenerative hydrogel is taken as a polymer electrolyte diaphragm for assembling a supercapacitor, and the obtained capacitor has higher specific capacitance and charging/discharging efficiency, and good rate capability and reversibility.

An ultracapacitor that includes an energy storage cell immersed in an electrolyte and disposed within an hermetically sealed housing, the cell electrically coupled to a positive contact and a negative contact, wherein the ultracapacitor has a gel or polymer based electrolyte and is configured to output electrical energy at temperatures between about −40° C. and about 250° C. Methods of fabrication and use are provided.

An ultracapacitor that includes an energy storage cell immersed in an electrolyte and disposed within an hermetically sealed housing, the cell electrically coupled to a positive contact and a negative contact, wherein the ultracapacitor has a gel or polymer based electrolyte and is configured to output electrical energy at temperatures between about −40° C. and about 250° C. Methods of fabrication and use are provided.

The invention provides an electrolyte solution capable of providing an electrochemical device having low resistance and excellent high-temperature storage characteristics and cycle characteristics. The electrolyte solution contains lithium fluorosulfonate and a solvent containing a compound (1) represented by the following formula (1): CF.sub.2HCOOCH.sub.3.

Formation process for a potassium-ion hybrid supercapacitor, the process comprising: a) supplying the potassium-ion hybrid supercapacitor comprising: a negative electrode comprising graphite, a positive electrode comprising activated carbon, an electrolyte comprising a potassium salt, b) charging the supercapacitor at constant current in a protocol of between C.sub.x/50 and C.sub.x/2, to a charge cutoff voltage of between 3.0 V and 3.3 V, c) holding the supercapacitor at the charge cutoff voltage until the leakage current is between C.sub.x/2000 and C.sub.x/500, d) discharging the supercapacitor at constant current in a protocol of between C.sub.x/50 and C.sub.x, to a discharge cutoff voltage of between 0 V and 2 V,
where the process further comprises degassing the supercapacitor after one of steps b) to d).

Formation process for a potassium-ion hybrid supercapacitor, the process comprising: a) supplying the potassium-ion hybrid supercapacitor comprising: a negative electrode comprising graphite, a positive electrode comprising activated carbon, an electrolyte comprising a potassium salt, b) charging the supercapacitor at constant current in a protocol of between C.sub.x/50 and C.sub.x/2, to a charge cutoff voltage of between 3.0 V and 3.3 V, c) holding the supercapacitor at the charge cutoff voltage until the leakage current is between C.sub.x/2000 and C.sub.x/500, d) discharging the supercapacitor at constant current in a protocol of between C.sub.x/50 and C.sub.x, to a discharge cutoff voltage of between 0 V and 2 V,
where the process further comprises degassing the supercapacitor after one of steps b) to d).

An electrolyte solution containing a solvent and a compound represented by the following formula (1), wherein R.sup.1 is a C1-C5 linear or branched non-fluorinated alkyl group optionally containing an ether bond. Also disclosed is an electrochemical device including the electrolyte solution, a lithium ion secondary battery including the electrolyte solution and a module including the electrochemical device or lithium ion secondary battery. ##STR00001##

The present invention relates in part to a polymer functionalized with a bio-ionic liquid to form a gel electrolyte. The gel electrolyte thus formed is biocompatible and biodegradable. In certain embodiments, the electrolyte is used for making implantable 3D printed energy storage devices.